Suitable replacment for this big fella?

[delaware74b]

Re: Suitable replacment for this big fella?

Noise from the motor itself isn't good. I bet you have a weak spot in the windings' insulation and it's going to ground. Unless it's 10 hp or higher, it's not worth having the windings replaced. 10-hp and smaller are usually considered disposable except for bearings or the centrifugal switch.

[Toasty]

Re: Suitable replacment for this big fella?

From what I understand that he is saying, it's tripping the thermal breaker on the motor. I'd expect, with a winding going to ground, for it to trip the breaker in the mains panel. That is, provided the unit is wired correctly to begin with...

[Krankshaft]

Re: Suitable replacment for this big fella?

Unless you're dealing with a cap issue, bearing issue, or centrifugal switch issue these no name probably Chinese motors aren't worth servicing.

At least it's a belt drive compressor so it should be relatively easy to replace.

[Toasty]

Re: Suitable replacment for this big fella?

Any word? Luck? Smoke & fire?

[c_hegge]

Re: Suitable replacment for this big fella?

I've given up. It's actually my dad's compressor. He's thinking about replacing it. It's several years old now.

[PCBONEZ]

Re: Suitable replacment for this big fella?

Late to the party but I already found these.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=190418553116

http://cgi.ebay.com/ws/eBayISAPI.dll...m=370383139333

http://cgi.ebay.com/ws/eBayISAPI.dll...m=310224383552

.
Had to replace that on my big old Craftsman compressor last year.
That compressor puts out 10-11cfm @90psi [I used to sand-blast cars] so replacing it wouldn't be cheap.
.

[Toasty]

Re: Suitable replacment for this big fella?

Same symptoms?

[dood]

Re: Suitable replacment for this big fella?

c_hegge- I had similar issues with my furnace motor. There were dead spots on the armature. Replaced motor, and life was good. If you carefully give it a spin when it's trying to start, will it run up to full speed? My furnace would get stopped in a dead spot, but start right up as soon as I gave it a spin. I had the advantage of not having a start cap to muddle the mix.

[PCBONEZ]

Re: Suitable replacment for this big fella?

Same symptoms?

Pretty much but mine didn't work fine 5% of the time.

[styxbound]

Re: Suitable replacment for this big fella?

The bearings good in this thing?

[c_hegge]

Re: Suitable replacment for this big fella?

...If you carefully give it a spin when it's trying to start, will it run up to full speed? ...

If you turn it while it tries to start, it spins up and runs for about 30 secs before tripping the breaker. During the 30 secs that it runs for, you can hear what sounds like arcing inside it.

[digge]

Re: Suitable replacment for this big fella?

Measure restistance on each coil (might be the wrong english word for it). Also measure between each coil and ground. You probably have some sort of short if you hear arcing. However fixing that is quite a bit of work, if there is a "slight" short.